selection of string value in expression for field value

[#1]

Dear Experts,

Help required to evaluate the following expression so that it will eliminate MaxID=41483 from selection and get only 'Max' field value in column.

Using following formula

Activity Count=Count({< MaxID = {"='>=' & 'Max' & '<=' & 'Max'"}>}{<Doc_Date = {">=$(vStartDate)<=$(vEndDate)"}>} EQUNR_S)

Activity Status	EQUNR_S	MaxID	Doc_Date	Activity Count
Surplus	20432	41483	07.08.2014	1
Under decommissioning	20432	Max	17.08.2014	1

Thanks

Ashif